The ones I find so far is ,
On Derketo religion camp
To the darfari camp outside the abysmal dungeon
To the mount of the dead
To the godbreaker dungeon
To the unnamed city
To all the above I remember the locations of the chests exactly .
Now in different servers if I remember correctly , nothing sure , it was on khari dungeon , on king barrow , frozen temple and kings niche . Yet I don’t remember well and I cannot say 100% .
I still haven’t visited the volcano dungeon after the Siptah release on consoles , I believe the serpent one must be there and maybe you need to search again the area of silent legion dungeon .
Again , I am 100% positive only for the first 5 locations , for all the others my memory might fool me , sry .